Commit c8bc6f3c authored by Suresh Siddha's avatar Suresh Siddha Committed by Thomas Gleixner
Browse files

x86: arch specific support for remapping HPET MSIs 



x86 arch support for remapping HPET MSI's by associating the HPET timer block
with the interrupt-remapping HW unit and setting up appropriate irq_chip

Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Jay Fenlason <fenlason@redhat.com>
LKML-Reference: <20090804190729.630510000@intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 20f3097b

arch/x86/include/asm/hpet.h

+3 −2
Original line number Diff line number Diff line
@@ -65,6 +65,7 @@ 
/* hpet memory map physical address */

extern unsigned long hpet_address;

extern unsigned long force_hpet_address;

extern u8 hpet_blockid;

extern int hpet_force_user;

extern int is_hpet_enabled(void);

extern int hpet_enable(void);
@@ -78,9 +79,9 @@ extern void hpet_msi_write(unsigned int irq, struct msi_msg *msg); 
extern void hpet_msi_read(unsigned int irq, struct msi_msg *msg);



#ifdef CONFIG_PCI_MSI

extern int arch_setup_hpet_msi(unsigned int irq);

extern int arch_setup_hpet_msi(unsigned int irq, unsigned int id);

#else

static inline int arch_setup_hpet_msi(unsigned int irq)

static inline int arch_setup_hpet_msi(unsigned int irq, unsigned int id)

{

	return -EINVAL;

}

arch/x86/kernel/acpi/boot.c

+1 −0
Original line number Diff line number Diff line
@@ -624,6 +624,7 @@ static int __init acpi_parse_hpet(struct acpi_table_header *table) 
	}



	hpet_address = hpet_tbl->address.address;

	hpet_blockid = hpet_tbl->sequence;



	/*

	 * Some broken BIOSes advertise HPET at 0x0. We really do not

arch/x86/kernel/apic/io_apic.c

+41 −8
Original line number Diff line number Diff line
@@ -3254,7 +3254,8 @@ void destroy_irq(unsigned int irq) 
 * MSI message composition

 */

#ifdef CONFIG_PCI_MSI

static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)

static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,

			   struct msi_msg *msg, u8 hpet_id)

{

	struct irq_cfg *cfg;

	int err;
@@ -3288,7 +3289,10 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_ms 
		irte.dest_id = IRTE_DEST(dest);



		/* Set source-id of interrupt request */

		if (pdev)

			set_msi_sid(&irte, pdev);

		else

			set_hpet_sid(&irte, hpet_id);



		modify_irte(irq, &irte);
@@ -3453,7 +3457,7 @@ static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq) 
	int ret;

	struct msi_msg msg;



	ret = msi_compose_msg(dev, irq, &msg);

	ret = msi_compose_msg(dev, irq, &msg, -1);

	if (ret < 0)

		return ret;
@@ -3586,7 +3590,7 @@ int arch_setup_dmar_msi(unsigned int irq) 
	int ret;

	struct msi_msg msg;



	ret = msi_compose_msg(NULL, irq, &msg);

	ret = msi_compose_msg(NULL, irq, &msg, -1);

	if (ret < 0)

		return ret;

	dmar_msi_write(irq, &msg);
@@ -3626,6 +3630,19 @@ static int hpet_msi_set_affinity(unsigned int irq, const struct cpumask *mask) 


#endif /* CONFIG_SMP */



static struct irq_chip ir_hpet_msi_type = {

	.name = "IR-HPET_MSI",

	.unmask = hpet_msi_unmask,

	.mask = hpet_msi_mask,

#ifdef CONFIG_INTR_REMAP

	.ack = ir_ack_apic_edge,

#ifdef CONFIG_SMP

	.set_affinity = ir_set_msi_irq_affinity,

#endif

#endif

	.retrigger = ioapic_retrigger_irq,

};



static struct irq_chip hpet_msi_type = {

	.name = "HPET_MSI",

	.unmask = hpet_msi_unmask,
@@ -3637,20 +3654,36 @@ static struct irq_chip hpet_msi_type = { 
	.retrigger = ioapic_retrigger_irq,

};



int arch_setup_hpet_msi(unsigned int irq)

int arch_setup_hpet_msi(unsigned int irq, unsigned int id)

{

	int ret;

	struct msi_msg msg;

	struct irq_desc *desc = irq_to_desc(irq);



	ret = msi_compose_msg(NULL, irq, &msg);

	if (intr_remapping_enabled) {

		struct intel_iommu *iommu = map_hpet_to_ir(id);

		int index;



		if (!iommu)

			return -1;



		index = alloc_irte(iommu, irq, 1);

		if (index < 0)

			return -1;

	}



	ret = msi_compose_msg(NULL, irq, &msg, id);

	if (ret < 0)

		return ret;



	hpet_msi_write(irq, &msg);

	desc->status |= IRQ_MOVE_PCNTXT;

	set_irq_chip_and_handler_name(irq, &hpet_msi_type, handle_edge_irq,

		"edge");

	if (irq_remapped(irq))

		set_irq_chip_and_handler_name(irq, &ir_hpet_msi_type,

					      handle_edge_irq, "edge");

	else

		set_irq_chip_and_handler_name(irq, &hpet_msi_type,

					      handle_edge_irq, "edge");



	return 0;

}

arch/x86/kernel/hpet.c

+2 −1
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ 
 * HPET address is set in acpi/boot.c, when an ACPI entry exists

 */

unsigned long				hpet_address;

u8					hpet_blockid; /* OS timer block num */

#ifdef CONFIG_PCI_MSI

static unsigned long			hpet_num_timers;

#endif
@@ -467,7 +468,7 @@ static int hpet_msi_next_event(unsigned long delta, 


static int hpet_setup_msi_irq(unsigned int irq)

{

	if (arch_setup_hpet_msi(irq)) {

	if (arch_setup_hpet_msi(irq, hpet_blockid)) {

		destroy_irq(irq);

		return -EINVAL;

	}

CRA Git | Maintained and supported by SUSTech CRA and CCSE